Police seized in the house of the suspect two rifles and 12mm bullets, the same types that were used to kill Merdas, a member of the liberal Constitutional Union Party (UC).
The Moroccan police said in a statement that the arrested individual is a 27-year-old with a criminal record who has previously made threats to Merdas concerning a “private dispute.”
Local news websites showed photos of the crime scene including the broken windows of Merdas’s car.
Merdas was hit by three bullets at 22:00 in his car in a Casablanca neighborhood. He succumbed to his injuries on the way to hospital as one of the bullets hit him in the head. According to testimonies, he was attacked by a person on board a small car using a hunting rifle.
The deceased, 53, was a UC deputy, representing the Ben Ahmed district, 60 kM south of Casablanca. He left behind a wife and three children.